63726707328 has 128 divisors (see below), whose sum is σ = 171745168320. Its totient is φ = 20934230016.

The previous prime is 63726707327. The next prime is 63726707333. The reversal of 63726707328 is 82370762736.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×63726707328² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63726707321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8090400 + ... + 8098272.

Almost surely, 2^63726707328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63726707328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85872584160).

63726707328 is an abundant number, since it is smaller than the sum of its proper divisors (108018460992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63726707328 is a wasteful number, since it uses less digits than its factorization.

63726707328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8194 (or 8182 counting only the distinct ones).

The product of its (nonzero) digits is 3556224, while the sum is 51.

The spelling of 63726707328 in words is "sixty-three billion, seven hundred twenty-six million, seven hundred seven thousand, three hundred twenty-eight".